The North Atlantic Marine Boundary Layer Experiment (NAMBLEX). Overview of the campaign held at Mace Head, Ireland, in summer 2002

• Main Authors: Heard, D. E., Read, K. A., Methven, J., Al-Haider, S., Bloss, W. J., Johnson, G. P., Pilling, M. J., Seakins, P. W., Smith, S. C., Sommariva, R., Stanton, J. C., Still, T. J., Brooks, B., de Leeuw, G., Jackson, A. V., Mcquaid, J. B., Morgan, R., Smith, M. H., Carpenter, L. J., Carslaw, N., Hamilton, J., Hopkins, J. R., Lee, J. D., Lewis, A. C., Purvis, R. M., Wevill, D. J., Brough, N., Green, T., Mills, G., Penkett, S. A., Plane, J. M. C., Saiz-Lopez, A., Worton, D., Monks, P. S., Fleming, Z., Rickard, A. R., Alfarra, M., Allan, J. D., Bower, K., Coe, H., Cubison, M., Flynn, M., Mcfiggans, G., Gallagher, M., Norton, E. G., O'Dowd, C. D., Shillito, J., Topping, D., Vaughan, G., Williams, P., Bitter, M., Ball, S. M., Jones, R. L., Povey, I. M., O'Doherty, S., Simmonds, P. G., Allen, A., Kinnersley, R. P., Beddows, D. C. S., Dall'Osto, M., Harrison, R. M., Donovan, R. J., Heal, M. R., Jennings, S. G., Noone, C., Spain, G.
• Other Authors: School of Chemistry Leeds, University of Leeds, Department of Meteorology Reading, University of Reading (UOR), Institute for Climate and Atmospheric Science Leeds (ICAS), School of Earth and Environment Leeds (SEE), University of Leeds-University of Leeds, The Netherlands Organisation for Applied Scientific Research (TNO), Department of Chemistry York, UK, University of York York, UK, Facility for Airborne Atmospheric Measurements ( Cranfield (FAAM), National Centre for Atmospheric Science Leeds (NCAS), Natural Environment Research Council (NERC)-Natural Environment Research Council (NERC), School of Environmental Sciences Norwich, University of East Anglia Norwich (UEA), Department of Chemistry Leicester, University of Leicester, School of Earth, Atmospheric and Environmental Sciences Manchester (SEAES), University of Manchester Manchester, National University of Ireland Galway (NUI Galway), University Chemical Laboratory, School of Chemistry, University of Bristol Bristol, School of Geography, Earth and Environmental Sciences Birmingham, University of Birmingham Birmingham, University of Edinburgh
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2005
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; Mace; North Atlantic
• Online Access: https://hal.science/hal-00301955; https://hal.science/hal-00301955/document; https://hal.science/hal-00301955/file/acpd-5-12177-2005.pdf

International audience The North Atlantic Marine Boundary Layer Experiment (NAMBLEX), involving over 50 scientists from 12 institutions, took place at Mace Head, Ireland (53.32° N, 9.90° W), between 23 July and 4 September 2002. A wide range of state-of-the-art instrumentation enabled detailed measurements of the boundary layer structure and atmospheric composition in the gas and aerosol phase to be made, providing one of the most comprehensive in situ studies of the marine boundary layer to date. This overview paper describes the aims of the NAMBLEX project in the context of previous field campaigns in the Marine Boundary Layer (MBL), the overall layout of the site, a summary of the instrumentation deployed, the temporal coverage of the measurement data, and the numerical models used to interpret the field data. Measurements of some trace species were made for the first time during the campaign, which was characterised by predominantly clean air of marine origin, but more polluted air with higher levels of NO x originating from continental regions was also experienced. This paper provides a summary of the meteorological measurements and Planetary Boundary Layer (PBL) structure measurements, presents time series of some of the longer-lived trace species (O 3 , CO, H 2 , DMS, CH 4 , NMHC, NO x , NO y , PAN) and summarises measurements of other species that are described in more detail in other papers within this special issue, namely oxygenated VOCs, HCHO, peroxides, organo-halogenated species, a range of shorter lived halogen species (I 2 , OIO, IO, BrO), NO 3 radicals, photolysis frequencies, the free radicals OH, HO 2 and (HO 2 +?RO 2 ), as well as a summary of the aerosol measurements. NAMBLEX was supported by measurements made in the vicinity of Mace Head using the NERC Dornier-228 aircraft. Using ECMWF wind-fields, calculations were made of the air-mass trajectories arriving at Mace Head during NAMBLEX, and were analysed together with both meteorological and trace-gas measurements. In this paper a ...